Allow bundling to work with rails4 dependencies.
Remove all attr_accessible calls.. replaced with warn
Allow database_cleaner to function.
Update support for assign_attributes.
Update regular expression to safer one.
Use official database_cleaner fork
Refactored internals for Rails 4

* We no longer have to care about attribute security (attr_accessible).
* Converted has_many options to use proc.
* Dynamic finders are no longer supported under Rails 4.
* Models no longer respond to update or create but instead save.
* set_table_name is no longer supported.
* Moved all test models into their own files.
* Fixed typo in NewsItem model where it translated name, not title.
* Rails 4.0.0 uses attributes= when directly specified.
Fix Gemfile local paths.

I was on an aeroplane.
Return correct value for empty strings.

"".presence => nil

Fixed test:
- dirty tracking works for blank assignment
Ported column_for_attribute delegation from master to rails4.
Added more failing specs.
Fixed another specs with some 'hacks?'.
Empty initialized translation is not save, but keeps its relation after parent save. Fixed spec.
Another failing specs for unexpected UPDATE while inserting new row.